The subsurface is used to cut a block of hexahedral cells, leaving all cells untouched by the cutting surface as perfect hexahedra, and producing a variety of cell types where the surface cuts the block.

... The meshes produced in this way tend to be of high quality and are very suitable for CFD – in general over 90% of the cells are perfect hexahedra with no distortion.

A cool idea, although it should be noted that the hexahedra will not be "flow aligned" and will, therefore, lose some of the accuracy that people usually associate with structured block grids.
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Attendance at Fluent's annual Users' Group Meetings gives our users a chance to interact with the top echelon of CFD users in the world. Come to this year's annual UGM and learn how others in industry are applying CFD, meet with our technical staff, and provide your input to the future development of the software you are using.

With the
latest release of their CFX 5 product, AEA technology claims it has sped up the solution of multiphase flows by orders of magnitude.

"Our new multiphase capability makes CFX-5 the first choice for simulating complex industrial flows" says Michael Raw, CFX VP of Product Development," it provides substantial benefits by solving the fluid equations together. This ensures that the strong inter-phase coupling which is usually a major cause of concern in traditional CFD codes is resolved in a robust and efficient manner".

Given the difficulty and often overwhelming size of these types of problems, advances of this nature are extremely welcome.